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Platinum substrate for surface plasmon microscopy at small angles.

Hossein Hassani, Nikolaus Radja Wolf, Xiaobo Yuan

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    |June 16, 2020
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    Platinum substrates offer high sensitivity for measuring dielectric properties and thin film thickness using surface plasmon microscopy. This technique accurately determines layer thickness, even for nanometer-scale structures.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Surface Science

    Background:

    • Surface plasmon resonance (SPR) is a label-free optical technique used to study molecular interactions.
    • Metal-dielectric interfaces are crucial for SPR-based sensing applications.
    • Platinum and gold are common substrates for SPR sensors, each with unique optical properties.

    Purpose of the Study:

    • To investigate the use of platinum as a substrate for surface plasmon microscopy (SPM) in small-angle measurements.
    • To compare the sensitivity of platinum-based SPR sensors with traditional gold SPR chips for refractive index and thickness measurements.
    • To demonstrate the capability of SPM with platinum substrates for precise thin-film thickness determination.

    Main Methods:

    • Surface plasmon microscopy (SPM) was employed for small-angle measurements at a metal-dielectric interface.
    • Angular spectra were analyzed to deduce optical properties and layer thickness.
    • Measurements were performed using a platinum substrate and compared to a gold surface plasmon resonance chip.
    • The thickness of a (3-Aminopropyl)triethoxysilane layer on platinum was measured.

    Main Results:

    • A sharp peak, near the critical angle, was observed in the angular spectrum of platinum, enabling refractive index and thickness determination in the absence of a narrow dip.
    • The sensitivity of refractive index and thickness measurements using platinum was comparable to that of a gold SPR chip.
    • The thickness of a (3-Aminopropyl)triethoxysilane layer was accurately measured to be 0.7 nm on the platinum substrate.

    Conclusions:

    • Platinum serves as an effective substrate for surface plasmon microscopy, particularly for small-angle measurements.
    • The technique demonstrates high sensitivity for determining the refractive index of dielectric media and the thickness of deposited layers.
    • Platinum-based SPR sensors offer a viable alternative to gold, with potential for precise nanometer-scale thin-film characterization.